Collected Papers On Acoustics

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Thirteen cushions from the seats in Sanders Theatre, whose absorbing power for sound had been determined in an earlier investigation, were brought into the room. Under these conditions the unanimous opinion was that the room, as tested by the piano, was lifeless. Two cushions were then removed from the room with a perceptible change for the better in the piano music. Three more cushions were re- moved, and the effect was much better. Two more were then taken out, leaving six cushions in the roo...m, and the result met unanimous approval. It was suggested that two more be removed. This being done the reverberation was found to be too great. The agreement was then reached that the conditions produced by the presence of six cushions were the most nearly satisfactory.
The experiment was then continued in Mr. Dunham's room, number 2. Six gentlemen were present. Seven cushions were 74 ARCHITECTURAL ACOUSTICS brought into the room. The music showed an insufficient rever- beration. Two of the cushions were then taken out.


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